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<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>

    const arr = ['A华北', 'A华南', 'B华南', 'A华东', 'B华东', 'A华西', 'C华北', 'C华东']

    function sort(params) {
      let A = params.filter((v) => v.match(/[A]+/g))
      console.log(params);
    }

    sort(arr)

  </script>
</body>

</html>